Diamond necklace



FIG. 1 is a top plan view of a diamond necklace showing my new design portions of the continuous neckchain being broken away for convenience of illustration;

FIG. 2 is a side elevational view thereof;

FIG. 3 is an end perspective view thereof; and

FIG. 4 is a bottom plan view thereof. 

The ornamental design for a diamond necklace, substantially as shown and described. 